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Daily North Atlantic Oscillation (NAO) Index
The daily NAO index (NAOI) is defined as same as the monthly NAO index (Li and Wang, 2003) except for the daily resolution.
Correlation maps between daily SLP anomalies in the NH (1950.1.1-2006.12.31) and (a) the daily NAO index (Li and Wang, 2003). The contour interval is 0.1. The red (blue) shaded area indicates significant at the 99.9% confidence level, and the efficient freedom of degrees is estimated at each grid (Davis 1976). The latitude lines are at 10 degree intervals starting with the equator at the edges.
Related References
- Li, J. P., and J. X. L. Wang, 2003: A new North Atlantic Oscillation index and its variability. Adv. Atmos. Sci., 20(5), 661-676. PDF
- Li, J. P., 2005: Coupled air-sea oscillations and climate variations in China, in: Climate and Environmental Evolution in China (First Volume), Edt. D. Qin, Beijing: China Meteorological Press, 324-333. PDF
| Filename | Size | Description |
| 16 kilobytes | NAO index | |
| You can download this file from here (right-click then select "Save Target As" or "Save Link As"). | ||
| File format |
| for year = 1948 to present format (i7, 365f7.2) year, 365 * daily value in the Average Year format (i7, 365f7.2) year, 365 * daily value in the Average Year |
| Note: (1) Missing values represented by -99.99; (2) The reference period is 1958-2000. |
Related Link: http://cmdp.ncc.cma.gov.cn/station/cn_annular_mode.php?periodType=Daily&Elem=NAOI